Hello, welcome to the Python Flask coding exercise at DevGrid's hiring process.

Rules:

1. 1. Having an Accepted solution to the presented challenge is mandatory to move forward in the process, to the final stage;
2. 2. When running submitted solutions, URI Online Judge expects them to read the input of a test case from stdin and output an answer to stdout, which should match the right answer absolutelly;
3. 3. There are hidden test cases apart from the presented one;
4. 4. Although solution correctness is evaluated automatically, your latest submitted code for each challenge can be later viewed and considered, so final code quality matters;
5. 5. The deadline for submitting solutions is 5 workdays after receiving the invite to join.

The average time to solve this challenge is between 1 to 2 hours.